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                [Usaco2011 Mar]Brownie Slicing                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：259MB</p>			</div>
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                                <h3>题目描述</h3><p>Bessie烘焙了一块巧克力蛋糕。这块蛋糕是由R*C(1 <= R,C <= 500)个小的巧克力蛋糕组成的。

第i行，第j列的蛋糕有N_ij(1 <= N_ij <= 4,000)块巧克力碎屑。

Bessie想把蛋糕分成A*B块，(1 <= A <= R,1 <= B <= C): 给A*B只奶牛。蛋糕先水平地切A-1刀

（只能切沿整数坐标切）来把蛋糕划分成A块。然后再把剩下来的每一块独立地切B-1刀，

也只能切沿整数坐标切。其他A*B-1只奶牛就每人选一块，留下一块给Bessie。由于贪心，

他们只会留给Bessie巧克力碎屑最少的那块。

求出Bessie最优情况下会获得多少巧克力碎屑。

例如，考虑一个5*4的蛋糕，上面的碎屑分布如下图所示：

         1 2 2 1

         3 1 1 1

         2 0 1 3

         1 1 1 1

         1 1 1 1

Bessie必须把蛋糕切成4条，每条分成2块。Bessie能像这样切蛋糕:

       1 2 | 2 1

       ---------

       3 | 1 1 1

       ---------

       2 0 1 | 3

       ---------

       1 1 | 1 1

       1 1 | 1 1

因此，其他贪得无厌的牛拿完后，Bessie仍能够拿走3个巧克力碎屑。
</p><hr/><h3>输入格式</h3><p>* 第1行: 四个空格隔开的数: R, C, A ，B
* 第2-R+1行: 第i+1行有C个整数, N_i1 , N_i2 .. N_iC
</p><hr/><h3>输出格式</h3><p>* 第1行: 一个整数: Bessie保证能拿到的最多碎屑数
</p><hr/><h3>样例输入</h3><pre>5 4 4 2
1 2 2 1
3 1 1 1
2 0 1 3
1 1 1 1
1 1 1 1

</pre><hr/><h3>样例输出</h3><pre>3
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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